Chung minh rang khong co so huu ti x nao thoa man :x^2=2
Tim cac so huu ti a va b biet rang hieu a-b bang thuong a:b va bang hai lan tong a+b
tim 3 so nguyen duong sao cho tong cac nhgich dao cua chung bang 2
Bai 1: so sanh 31^11 va 17^14
Bai2: So hoc sinh khoi 6,7,8,9 cua mot truong THCS ti le vs cac so 9;8;8;6. Biet rang tong so hoc sinh khoi 8 va khoi 9 it hon tong so hoc sinh khoi 6 va khoi 7 la 120 hoc sinh. Tinh so hoc sinh moi khoi?
Bai3: bai toan ap dung tinh chat cua day ti so bang nhau :
Tim dien tich cua mot hinh chu nhat biet i so giua chieu dai va chieu rong cua hinh chu nhat do la 3/2 va chu vi hinh chu nhat la 20 met.
Giup mk vs mai mk nop r! Can gap!
bieu dien so huu ti 4/3 tren truc so
bieu dien so huu ti 5/-4 tren truc so
Tim 20 so huu ti x : -1 < x<0
Tim 5 so huu ti x : \(\dfrac{-5}{6}\) <x<\(\dfrac{-3}{4}\)
Cho cac so thap phan vo han tuan hoan duoc viet duoi dang chu ki sau: 0,(35); 1,235; 1,2(51)
Hay viet chung duoi dang phan so.
Cho a,b,c duong. Chung minh \(M=\dfrac{a}{a+b}+\dfrac{b}{b+c}+\dfrac{c}{c+a}\) \(\notin Z\)
